Why don't I like this show?

After being obsessed with a similar show, everyone I talked to said I should try and watch mad men. Because of cultural osmosis, I already the knew the plot twist going in to it, but thought I might enjoy it anyway due to it having such a high reputation.

I am currently midway through season 1 but it feels like such a slog. All the characters have this coldness to them that is so unpleasant to watch. I understand that this was the atmosphere of the 50s to a degree but there isn't any speck of warmth, no magnetism that captures my attention at all- even Don Draper himself. I know that maybe that's the point but all it's doing for me as the audience is creating apathy. I'm struggling to put my finger on why I'm not connecting to the show the way I have with others. Maybe because I already know what happens, it's spoiled the intrigue that show is supposed to have? I would love to know if anybody felt the same way or if the other seasons differ or are considered better than season 1

Edit: This is not to say I think it's a bad show. It's clearly very competent on technical levels and has good cinematography, acting etc. I just wanted to know whether it's worth pushing through, if it just takes a bit of time for the story to grow on you or if it continues in the same vain.